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A090155
Primes of the form identical digits preceded by a 7.
3
7, 71, 73, 79, 733, 7333, 79999, 733333, 799999, 71111111, 799999999, 79999999999, 79999999999999999999999999, 79999999999999999999999999999999999999999999999999
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OFFSET
1,1
LINKS
Vincenzo Librandi,
Table of n, a(n) for n = 1..24
MATHEMATICA
Select[ FromDigits /@ Flatten[ Table[ PadRight[{7}, i, # ] & /@ {1, 2, 3, 4, 5, 6, 7, 8, 9}, {i, 2, 50}], 1], PrimeQ[ # ] &]
CROSSREFS
Sequence in context:
A200929
A111462
A045713
*
A326740
A107163
A179784
Adjacent sequences:
A090152
A090153
A090154
*
A090156
A090157
A090158
KEYWORD
nonn
,
base
AUTHOR
Robert G. Wilson v
, Nov 22 2003
STATUS
approved
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Last modified April 24 00:30 EDT 2024. Contains 371917 sequences. (Running on oeis4.)